I now have the car back on the road, fortunately Brands Hatch Morgan had the parts in stock for one side and I will replace the other side when the parts ordered arrive.
BHM were very helpful and made sure all the fittings went together well before I left, which was a nice touch.
As I replaced the crosshead strut bar and mounting foot together I made the leap to the later UNF threaded parts, for reference that is the only difference, they fit fine on an earlier car.
I did call other Morgan parts suppliers a few times and sent polite detailed emails requesting parts, unfortunately I have not had any response.
Many thanks to all who responded to my post on here with helpful advice.
